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Vaginal infections are a very common cause for the pH of the vagina to rise. The most common vaginal infection in my practice (and in all doctor's offices) is Bacterial Vaginosis which causes the normal vaginal pH to rise to above 4.5. Odor usually occurs with Bacterial Vaginosis.
This shows that charges on salts affect their solution pH. Positive charges contributes to lower pH and negative charges increase pH. In anaerobic digesters, more cations (Zn2+, Cu2+, Ca2+, Fe3+) will be leached out at higher temperature (thermophilic) and the pH becomes lower (Positive charges contribute to lower pH).